Nice find, if it has 115" wheel base (Hub to Hub) it is a 1/2 ton, 125" it's a 3/4 ton. The bed in the picture is not a Chevy bed, if the passenger side door handle has the lock in the handle it is a
41 after that the lock was in door below handle. looks like the orig. 216cu. motor correct horn.
rear end is most likely 4:10 gear. 16 inch wheels were stock. Should be 6 lug front and rear.
Here is a link
www.stovebolt.com
I have a 41 1/2 ton in progress now. 235 inline 6, (stock) 4spd trans. 3.55:1 rear gear.
best of luck and post more pictures when you can.